Torsional Testing of Timber – Participant Quiz

What is the primary purpose of torsional testing on timber?

• To determine moisture content

• To evaluate tensile strength

• To determine shear modulus and torsional strength

• To measure bending capacity

According to EN 408, specimens for torsional testing should be:

• Moisture saturated and curved

• Rectangular and free from major defects

• Circular and knot-free

• Any shape and orientation

Which of the following must be recorded during a torsional test?

• Time and moisture gain

• Torque and angle of twist

• Load duration

• Compression force and strain

What formula is used to calculate shear modulus (G) from torsional test results?

• G = (M * θ) / (L * J)

• G = (T * L) / (J * θ)

• G = (F * L) / (E * A)

• G = T / A

What is the polar moment of inertia (J) used for in torsional testing?

• Calculating bending stress

• Estimating compressive strength

• Determining torque-related stiffness

• Measuring test duration

What is a key indicator of correct specimen mounting in the torsion grips?

• Maximum moisture absorption

• No twisting deformation

• Absence of eccentric bending

• Early specimen failure

Which of the following should NOT occur during a standard torsional test?

• Consistent torque application

• Continuous recording of twist angle

• Misalignment of specimen ends

• Proper labelling of test data

A failure mode typically observed in torsional testing of timber is:

• Splitting along the grain

• Compression failure

• Delamination at joints

• Elastic buckling

Which software parameter is most important during a torsional test?

• Load rate for compression

• Torque and angular deformation capture

• Strain and temperature levels

• Vibration frequency

After a test, all observations should be:

• Estimated visually only

• Ignored if failure mode is common

• Recorded and stored with test ID

• Transferred to bending report